We had a whole house fan built into the ceiling of our central upstairs hallway and wow does it do a good job of keeping the temps down.
All our interior walls are insulated and have sound batting so the builder recommended we vent the house or it could be steamy in summer. Good call on his part. I have no clue what brand it is but ours has the louvers and we have a switch in the hall to turn the fan on/off.
Make sure you have easy access as in winter I have to climb in the attic and place an included insulating blanket/cover over the fan to prevent warm arm from escaping. The builder also put several bats of insulation in the attic as added insulation over the cover. We have batted insulation with blown-in insulation on top of that in our attic so I have to be careful when up there since you can't see the joists.
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